Pronóstico: Highest temperature in Shanghai on July 3?

Platform comparison

Market context

The highest temperature recorded at Shanghai Pudong International Airport on 3 July 2026 will determine the outcome of this Polymarket contract, with the market currently pricing the 31°C range at 42% and the 30°C range at 32%, while the 29°C outcome sits at 31.5%[1][3]. The crowd-implied probability of 0% for the YES outcome appears to be a misinterpretation of the conditional token structure, as the market clearly assigns significant weight to temperatures exceeding 29°C. Traders on the Polygon network using USDC should note that these conditional tokens resolve based on Wunderground’s daily high for all times on that specific date, not an abstract average.

Historically, July is Shanghai’s hottest month, with daily highs generally above 30°C and often reaching around 35°C, driven by the subtropical monsoon climate and high humidity levels that exceed 75% during this period[2]. The plum rainy season, which runs from mid-June to early July, typically brings consistent rain and shorter sunshine hours, yet temperatures still frequently breach 30°C, with some days recording apparent temperatures as high as 38°C[2][8]. This historical pattern suggests that a 0% probability for temperatures above 29°C is statistically inconsistent with the region’s typical July climate, where the average high for July is 32°C and the 3rd of July specifically has recorded highs near 32.5°C in recent years[5][6].

Traders should monitor the official weather schedules for Shanghai, particularly any announcements regarding typhoon activity or extreme heat alerts, as these can significantly alter temperature outcomes[2][10]. The typhoon season begins in late July, but early signs of strong wind or heavy rain could suppress temperatures, while a lack of cloud cover during the plum rainy season’s tail end could lead to heat spikes. Recent news reports highlight China’s battle with extreme heatwaves in Shanghai, with heat alerts issued for the region, indicating that temperatures could reach as high as 38°C if conditions remain dry and sunny[10]. These dependencies mean that the market’s current pricing may need adjustment if weather forecasts shift toward more cloud cover or precipitation.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in Shanghai on July 3? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Argentina, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.